No Unbiased Estimator of the Variance of K-Fold Cross-Validation
Yoshua Bengio and Yves Grandvalet

@article{5:39,author={Yoshua Bengio and Yves Grandvalet}, Title={No Unbiased Estimator of the Variance of K-Fold Cross-Validation},journal={Journal of Machine Learning Research},volume={5}, url={http://www.jmlr.org/papers/volume5/sallans04a/sallans04a.pdf}}